CN111535962A - Heavy diesel engine high pressure common rail fuel system - Google Patents
Heavy diesel engine high pressure common rail fuel system Download PDFInfo
- Publication number
- CN111535962A CN111535962A CN202010355226.9A CN202010355226A CN111535962A CN 111535962 A CN111535962 A CN 111535962A CN 202010355226 A CN202010355226 A CN 202010355226A CN 111535962 A CN111535962 A CN 111535962A
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- Prior art keywords
- oil
- fuel
- filter
- return
- pump
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- 239000000446 fuel Substances 0.000 title claims abstract description 94
- 239000003921 oil Substances 0.000 claims abstract description 228
- 238000002347 injection Methods 0.000 claims abstract description 32
- 239000007924 injection Substances 0.000 claims abstract description 32
- 239000000295 fuel oil Substances 0.000 claims abstract description 27
- 239000002828 fuel tank Substances 0.000 claims abstract description 26
- 238000011045 prefiltration Methods 0.000 claims abstract description 22
- 238000012546 transfer Methods 0.000 claims description 21
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000178 monomer Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 24
- 238000013461 design Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M33/00—Other apparatus for treating combustion-air, fuel or fuel-air mixture
- F02M33/02—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel
- F02M33/08—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel returning to the fuel tank
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a high-pressure common rail fuel system of a heavy diesel engine, which comprises a fuel tank, a prefilter, a low-pressure fuel delivery pump, a filter, a monomer pump, an engine, a fuel injector and a fuel rail, wherein the fuel tank is connected with the low-pressure fuel delivery pump through a fuel pipe, and the prefilter is arranged between the fuel tank and the low-pressure fuel delivery pump; the low-pressure fuel delivery pump is connected with an oil inlet of the filter, fuel enters an oil outlet of the filter after being filtered by a filter element in the filter, and the oil outlet of the filter is connected with an oil inlet of the fuel injection pump; returning oil of the oil injector and returning oil of the fuel oil rail to an oil return collection cavity in the filter and then to a main oil return cavity of the low-pressure oil delivery pump; part of fuel oil in a main oil return cavity of the low-pressure fuel delivery pump directly enters the front end oil inlet side of the low-pressure fuel delivery pump through the overflow valve to continue to circulate, so that the energy consumption of fuel oil repeated transportation is effectively reduced, the power consumption of the fuel delivery pump is reduced, meanwhile, the filtering efficiency of the filter is improved, and the service life of the prefilter is prolonged; the invention has simple structure, high integration level and high system operation reliability.
Description
Technical Field
The invention relates to an automobile air conditioning system, in particular to a high-pressure common rail fuel system of a heavy diesel engine.
Background
Chinese patent CN 202250513U: the automatic exhaust fuel system comprises an oil tank, an engine control unit, a high-pressure oil pump, a fine filter, a high-pressure oil rail, an oil sprayer, an electric oil delivery pump and a one-way valve. The fuel system utilizes an electric pump to exhaust a system oil path before the engine is started, so that the engine can be started quickly.
Chinese patent CN 108457781A: a fuel system of a heavy diesel engine comprises an oil tank, an engine control unit, a high-pressure oil pump, a fine filter, a high-pressure oil rail and a pump nozzle fuel injector. An automatic exhaust three-way valve is arranged on a base of the fuel filter, an inlet of the automatic exhaust three-way valve is communicated with an oil outlet of the fuel tank sequentially through a first oil path and a low-pressure fuel delivery pump, a first outlet of the automatic exhaust three-way valve is communicated with an oil inlet of the low-pressure fuel delivery pump sequentially through a second oil path, a fuel injector assembly and an oil return pipeline, and a second outlet of the automatic exhaust three-way valve is communicated with an oil inlet of the fuel tank through an exhaust pipeline. The design not only realizes the automatic exhaust under the running state of the engine, but also promotes the filtering efficiency of the fuel filter and prolongs the service life of the prefilter.
The technical scheme has the following problems: 1. before the engine is started, the electric pump is used for exhausting gas, and gas sucked by negative pressure in the running process of the engine cannot be automatically exhausted, so that the performance of the engine is also influenced; 2. the return oil of the system directly returns to the oil tank, so that certain influence is exerted on the filtering efficiency of the filter, and the service life of the pre-filter is also lost; 3. the structure is complicated, and the pipeline arrangement is complicated.
Disclosure of Invention
In order to solve the problems, the invention provides a high-pressure common rail fuel system of a heavy diesel engine, which has a simple structure and reliable system operation.
The technical scheme adopted by the invention is as follows: the utility model provides a heavy diesel engine high pressure common rail fuel oil system, includes fuel tank, prefilter, low pressure fuel delivery pump, filter, monoblock pump, engine, sprayer and fuel oil rail, its characterized in that: the fuel tank is connected with a low-pressure fuel delivery pump through an oil pipe, and the prefilter is arranged between the fuel tank and the low-pressure fuel delivery pump; the low-pressure fuel delivery pump is connected with an oil inlet of the filter, fuel enters an oil outlet of the filter after being filtered by a filter element in the filter, and the oil outlet of the filter is connected with an oil inlet of the fuel injection pump;
the return oil of the oil injector and the return oil of the fuel oil rail return to an oil return collection cavity in the filter and then return to a main oil return cavity of the low-pressure oil delivery pump; and one part of fuel oil in the main oil return cavity of the low-pressure fuel delivery pump directly enters the front end oil inlet side of the low-pressure fuel delivery pump through the overflow valve to continue to circulate, and the other part of the fuel oil returns to the fuel tank through the throttling hole. The return oil is subjected to matched shunting through an overflow valve and an orifice in a main oil return cavity, 80% of the return oil directly enters the oil inlet side of the oil transfer pump after passing through the overflow valve, is mixed with the inlet oil at the pre-filtering end and is conveyed to the oil injection pump through the oil transfer pump in a pressurization mode, the repeated fuel oil conveying energy consumption is effectively reduced, and therefore the power consumption of the oil transfer pump is reduced.
Preferably, a check valve is arranged on the oil return channel of the oil injection pump. And in the working stage of the electric pump, the return oil of the active exhaust hole of the filter enters the pump cavity of the high-pressure pump, and meanwhile, the return of the gas in the shutdown stage to the pump cavity of the high-pressure pump is reduced, so that the robustness of the system is improved.
Preferably, an overflow valve is arranged on the oil return channel of the oil injection pump and close to the end of the oil return collection cavity, and the overflow valve controls the oil inlet pressure of the oil injection pump to ensure stable operation of the engine.
Preferably, when the whole vehicle is started for the first time or does not run for a long time, a large amount of gas is gathered in a fuel oil pipeline, the gas at the upstream of the pressure side filter enters the filter and then enters the oil return collection cavity through the active exhaust hole, and the gas at the downstream of the pressure side filter returns to the oil return collection cavity through the exhaust bypass hole of the oil return channel of the oil injection pump; the gas in the return oil collecting cavity returns to the main return oil cavity and then returns to the oil tank through the throttling hole; and in the normal operation stage of the engine, after gas in the fuel enters the pressure side filter, the gas returns to the return oil collecting cavity through the active exhaust hole and then returns to the main return oil cavity, part of the gas in the fuel in the main return oil cavity returns to the oil tank, and the other part of the gas enters the front end of the low-pressure oil delivery pump to continue circulation. The system ensures that the fuel system can be quickly emptied through a two-stage exhaust design, realizes system pre-charging, ensures the starting reliability of the system, and simultaneously ensures that fuel steam and air return to an oil tank in the operation stage.
Preferably, the filter integrates an aftertreatment HC injection metering unit and a return oil collection chamber.
Preferably, the oil injection pump adopts a monoblock pump, and a monoblock pump body is integrated with the oil cylinder body, so that the noise and the vibration characteristic of the whole machine are reduced.
Preferably, the fuel tank and the prefilter are mounted to the frame.
Preferably, the low pressure fuel pump, filter and fuel rail are mounted on the engine.
Preferably, a main oil return cavity, an oil inlet of the oil transfer pump and an oil outlet of the oil transfer pump are integrated on the low-pressure oil transfer pump, an oil return port of the main oil return cavity is communicated with an oil return collection cavity, an overflow valve and a throttling hole are arranged at the oil return port, and fuel oil enters the main oil return cavity after passing through the overflow valve and enters the fuel tank after passing through the throttling hole; the oil inlet of the oil transfer pump is communicated with the prefilter, and the oil outlet of the oil transfer pump is communicated with the oil inlet of the filter.
The beneficial effects obtained by the invention are as follows: the invention has simple structure, high integration level, high system operation reliability and energy saving. The return oil is matched and shunted through an overflow valve and a throttling hole at an oil inlet of a main oil return cavity, 80% of the return oil directly enters the oil inlet side of a low-pressure oil transfer pump after passing through the overflow valve, is mixed with the inlet oil at the end of the prefilter and is conveyed to an oil injection pump through the low-pressure oil transfer pump in a pressurization mode, the repeated fuel oil conveying energy consumption is effectively reduced, the power consumption of the oil transfer pump is reduced, meanwhile, the filtering efficiency of a filter can be improved, and the.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic diagram of the low pressure oil transfer pump of the present invention;
FIG. 3 is a schematic diagram of the arrangement of the oil return port of the main oil return cavity on the low-pressure oil transfer pump;
reference numerals: 1. an engine; 2. an oil rail; 3. an oil injector; 4. a low pressure oil transfer pump; 40. A main oil return cavity oil return port; 41. a total oil return cavity; 42. an oil inlet of the oil transfer pump; 43. an oil outlet of the oil transfer pump; 5. an injection pump; 6. a prefilter; 7. fuel gas; 8. a filter; 9/11, an overflow valve; 10. a one-way valve; 12. an orifice.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments.
As shown in figure 1, the high-pressure common rail fuel system of the heavy diesel engine comprises a fuel tank 7, a prefilter 6, a low-pressure fuel delivery pump 4, a filter 8, a fuel injection pump 5 (a single pump), an engine 1, a fuel injector 3 and a fuel rail 2, wherein the fuel tank 7 and the prefilter 6 are installed on a frame, the low-pressure fuel delivery pump 4, the fuel injection pump 5 (the single pump), the filter 8 and the fuel rail 2 are installed on the engine 1, and the fuel injector 3 is installed in a rocker arm chamber and connected with each other through a fuel pipe. Simple structure, the integrated level is high.
In the embodiment, the oil injection pump 5 adopts a monoblock pump, and a monoblock pump body is integrated with the oil cylinder body of the engine 1 (the installation position of the monoblock pump is preset on the oil cylinder body of the engine), so that the noise and the vibration characteristic of the whole engine are reduced.
In this embodiment, filter 8 adopts the modularized design, and integrated aftertreatment HC sprays the measurement unit and returns the oil and collects the chamber, adopts the environmental protection to strain the design theory simultaneously, can only change the filter core in filter 8 changes the in-process.
In the embodiment, a fuel tank 7 is connected with a low-pressure fuel delivery pump 4 through an oil pipe, and a prefilter 6 is arranged between the fuel tank 7 and the low-pressure fuel delivery pump 4; the low-pressure fuel delivery pump 4 is connected with an oil inlet of the filter 8, fuel enters an oil outlet of the filter 8 after being filtered by a filter element in the filter 8, and the oil outlet of the filter 8 is connected with an oil inlet of the fuel injection pump 5; the fuel oil in the fuel tank 7 enters the low-pressure fuel delivery pump 4 after being filtered by the prefilter 6, and the fuel oil is pumped into the filter 8 by the low-pressure fuel delivery pump 4 for further filtering and then is pumped into the oil cylinder of the engine 1 by the fuel injection pump 5.
The oil return comprises oil rail oil return, oil injector oil return, oil injection pump oil return and oil injection pump plunger leakage oil return, wherein the oil rail oil return and the oil injector oil return share one oil return pipe, four paths of return oil return are sent to an oil return collection cavity integrated by a filter 8 and are mixed to be integrally returned to a total oil return cavity 41 integrated by a low-pressure oil delivery pump 4, one part (about 80 percent) of fuel oil in the total oil return cavity 41 directly enters the front end oil inlet side of the low-pressure oil delivery pump 4 through an overflow valve 11 (one-way valve), is mixed with oil inlet oil at the end of a prefilter 6 and is conveyed to an oil injection pump 5 through the low-pressure oil delivery pump 4 in a pressurizing mode, and the other part of the fuel oil returns to. The energy consumption of fuel oil repeated transportation is effectively reduced, so that the power consumption of the low-pressure fuel delivery pump 4 is reduced; meanwhile, the filtering efficiency of the filter 8 can be improved, and the service life of the prefilter 6 is prolonged.
In this embodiment, the check valve 10 is disposed on the oil return channel of the fuel injection pump, so as to prevent oil returned from the active exhaust hole of the filter 8 from entering the pump cavity of the fuel injection pump 5 (high-pressure oil pump) during the working stage of the electric pump, and to reduce gas backflow during the shutdown stage to the pump cavity of the high-pressure oil pump, thereby improving the robustness of the system.
In this embodiment, an overflow valve 9 is arranged on the oil return channel of the injection pump, near the end of the oil return collection cavity, and the overflow valve 9 controls the oil inlet pressure of the injection pump 5 to ensure the stable operation of the engine 1.
Referring to fig. 2-3, in the present embodiment, a total oil return cavity 41, an oil inlet 42 of the oil transfer pump and an oil outlet 43 of the oil transfer pump are integrated on the low-pressure oil transfer pump 4, an oil return port 40 of the total oil return cavity is communicated with an oil return collection cavity integrated on the filter 8, an overflow valve 11 and an orifice 12 are arranged at the oil return port 40, and fuel oil enters the total oil return cavity 40 after passing through the overflow valve 11 and enters the fuel tank 7 after passing through the orifice 12; an oil inlet 42 of the oil delivery pump is communicated with the prefilter 6, and an oil outlet 43 of the oil delivery pump is communicated with an oil inlet of the filter 8.
If the whole vehicle is started for the first time or does not run for a long time, a large amount of gas can be accumulated in the fuel pipeline, and after the electric pump is electrified and works, the gas is conveyed from the upstream to the downstream of the fuel system and finally returns to the fuel tank 7 through the oil return pipe. The specific principle is as follows: the gas at the upstream of the pressure side filter enters the filter 8 and then enters the return oil collecting cavity through the active exhaust hole, the gas at the downstream of the pressure side filter returns to the return oil collecting cavity through the exhaust bypass hole of the return oil channel of the fuel injection pump, and the gas returns to the main return oil cavity 40 through the main return oil pipeline. Before the whole vehicle is started, the electric pump controls the electrified pump oil to supply oil to the system, the system can ensure that the fuel oil system can be quickly emptied through a two-stage exhaust design, the system pre-charge is realized, and the starting reliability of the system is ensured.
In the normal operation stage of the engine, after gas (dissolved gas and fuel vapor) in fuel enters a pressure side filter, the gas returns to a return oil collecting cavity through an active exhaust hole and returns to a total return oil cavity 40, a small amount of gas can be shunted at the position, one part of the gas returns to a fuel tank 7, the other part of the gas enters the front end of a low-pressure fuel delivery pump 4 and continues to circulate, and the gas does not enter a fuel injection pump cavity and does not influence the pumping performance of a fuel injection pump 5 and the rail pressure stability of a fuel rail 2. The two-stage exhaust design of the system not only ensures that the system is emptied and pre-filled in the starting stage, but also ensures that fuel steam and air return to the fuel tank in the running stage.
The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a heavy diesel engine high pressure common rail fuel oil system, includes fuel tank, prefilter, low pressure fuel delivery pump, filter, monoblock pump, engine, sprayer and fuel oil rail, its characterized in that: the fuel tank is connected with a low-pressure fuel delivery pump through an oil pipe, and the prefilter is arranged between the fuel tank and the low-pressure fuel delivery pump; the low-pressure fuel delivery pump is connected with an oil inlet of the filter, fuel enters an oil outlet of the filter after being filtered by a filter element in the filter, and the oil outlet of the filter is connected with an oil inlet of the fuel injection pump;
the return oil of the oil injector and the return oil of the fuel oil rail return to an oil return collection cavity in the filter and then return to a main oil return cavity of the low-pressure oil delivery pump; and one part of fuel oil in the main oil return cavity of the low-pressure fuel delivery pump directly enters the front end oil inlet side of the low-pressure fuel delivery pump through the overflow valve to continue to circulate, and the other part of the fuel oil returns to the fuel tank through the throttling hole.
2. The heavy duty diesel engine high pressure common rail fuel system of claim 1, wherein: and a check valve is arranged on the oil return channel of the oil injection pump.
3. The heavy duty diesel engine high pressure common rail fuel system of claim 1, wherein: and an overflow valve is arranged on the oil return channel of the oil injection pump and close to the end of the oil return collection cavity.
4. The heavy duty diesel engine high pressure common rail fuel system of claim 1, wherein: the whole vehicle is started for the first time or does not run for a long time, a large amount of gas is gathered in a fuel oil pipeline, the gas at the upstream of the pressure side filter enters the filter and then enters the oil return collection cavity through the active exhaust hole, and the gas at the downstream of the pressure side filter returns to the oil return collection cavity through the exhaust bypass hole of the oil return channel of the oil injection pump; and the gas in the oil return collection cavity returns to the total oil return cavity and then returns to the oil tank through the throttling hole.
5. The heavy duty diesel high pressure common rail fuel system of claim 1 or 4, wherein: and in the normal operation stage of the engine, after gas in the fuel enters the pressure side filter, the gas returns to the return oil collecting cavity through the active exhaust hole and then returns to the main return oil cavity, part of the gas in the fuel in the main return oil cavity returns to the oil tank, and the other part of the gas enters the front end of the low-pressure oil delivery pump to continue circulation.
6. The heavy duty diesel engine high pressure common rail fuel system of claim 1, wherein: the filter integrates an aftertreatment HC injection metering unit and an oil return collection cavity.
7. The heavy duty diesel engine high pressure common rail fuel system of claim 1, wherein: the oil injection pump adopts a monoblock pump, and a monoblock pump body is integrated with the oil cylinder body.
8. The heavy duty diesel engine high pressure common rail fuel system of claim 1, wherein: the fuel tank and the prefilter are mounted on the frame.
9. The heavy duty diesel engine high pressure common rail fuel system of claim 1, wherein: the low-pressure fuel delivery pump, the filter and the fuel oil rail are arranged on the engine.
10. The heavy duty diesel engine high pressure common rail fuel system of claim 1, wherein: the low-pressure fuel delivery pump is integrated with a main oil return cavity, a fuel delivery pump oil inlet and a fuel delivery pump oil outlet, an oil return port of the main oil return cavity is communicated with an oil return collecting cavity, an overflow valve and a throttling hole are arranged at the oil return port, and fuel oil enters the main oil return cavity after passing through the overflow valve and then enters the fuel tank after passing through the throttling hole; the oil inlet of the oil transfer pump is communicated with the prefilter, and the oil outlet of the oil transfer pump is communicated with the oil inlet of the filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010355226.9A CN111535962A (en) | 2020-04-29 | 2020-04-29 | Heavy diesel engine high pressure common rail fuel system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010355226.9A CN111535962A (en) | 2020-04-29 | 2020-04-29 | Heavy diesel engine high pressure common rail fuel system |
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| Publication Number | Publication Date |
|---|---|
| CN111535962A true CN111535962A (en) | 2020-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010355226.9A Pending CN111535962A (en) | 2020-04-29 | 2020-04-29 | Heavy diesel engine high pressure common rail fuel system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112431698A (en) * | 2020-11-03 | 2021-03-02 | 无锡华友发电设备有限公司 | Device for realizing stable fuel supply of diesel generator set |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206129466U (en) * | 2016-08-30 | 2017-04-26 | 潍柴动力股份有限公司 | Fire oil filter , engine fuel oil system and engine |
| CN210068353U (en) * | 2019-04-04 | 2020-02-14 | 东风商用车有限公司 | Integrated oil transfer pump of heavy diesel engine |
| CN212337506U (en) * | 2020-04-29 | 2021-01-12 | 东风商用车有限公司 | Heavy diesel engine high pressure common rail fuel system |
-
2020
- 2020-04-29 CN CN202010355226.9A patent/CN111535962A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206129466U (en) * | 2016-08-30 | 2017-04-26 | 潍柴动力股份有限公司 | Fire oil filter , engine fuel oil system and engine |
| CN210068353U (en) * | 2019-04-04 | 2020-02-14 | 东风商用车有限公司 | Integrated oil transfer pump of heavy diesel engine |
| CN212337506U (en) * | 2020-04-29 | 2021-01-12 | 东风商用车有限公司 | Heavy diesel engine high pressure common rail fuel system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112431698A (en) * | 2020-11-03 | 2021-03-02 | 无锡华友发电设备有限公司 | Device for realizing stable fuel supply of diesel generator set |
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